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Computer Engineering
Consider the following relational schema. Emp(eid,did,sal,hobby) Dept(did,dname,floor,phone) Finance(did,budget,sales,expences) For the following query, prepare the initial (canonical) query tree, then show how the query tree is optimized by the use of heuristic optimization. (Provide all the relational algebra expressions for the query trees). ‘Find the department name and budget value for the departments where the salary of employee is lower than Rs.59000 and hobby is ‘Gardening’ and the department located in floor no. 3’.

Consider the following relational schema. Emp(eid,did,sal,hobby) Dept(did,dname,floor,phone) Finance(did,budget,sales,expences) For the following query, prepare the initial (canonical) query tree, then show how the query tree is optimized by the use of heuristic optimization. (Provide all the relational algebra expressions for the query trees). ‘Find the department name and budget value for the departments where the salary of employee is lower than Rs.59000 and hobby is ‘Gardening’ and the department located in floor no. 3’.

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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  1. Consider the following relational schema.

Emp(eid,did,sal,hobby)

Dept(did,dname,floor,phone)

Finance(did,budget,sales,expences)

For the following query, prepare the initial (canonical) query tree, then show how the query tree is optimized by the use of heuristic optimization. (Provide all the relational algebra expressions for the query trees).

‘Find the department name and budget value for the departments where the salary of employee is lower than Rs.59000 and hobby is ‘Gardening’ and the department located in floor no. 3’.

 

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